Brake mechanism for sewing-machines



(No Model.)

J. B. DESNOYERS & 'G. SINNING.

BRAKE MECHANISM FOR SEWING MACHINES.

Patented Jan. 8, 1884.-

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ilnirnn STATES PATENT @rricn.

JEROME B. DESNOYERS AND CHARLES SINNING, OF ST. LOUIS, MISSOURI.

BRAKE MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 291,700, dated January 8, 1884.

Application filed October 31, 1883. (No model.)

T0 at whom it may concern.-

Be it known thatwc, J nnonn B. DESNOY- ERS and Ci-mnrns SINNrNo, both of the city of St. Louis and State of Missouri, have invented a certain new and useful Improvement in Sewing-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

Our improvement relates to a sewing-machine brake, and the same is shown applied to a sewing-machine in which the belt has continuous movement,) as in machines driven by power, although the improvement may be applied to hand-machines.

The invention consists in a braking device which will always bring the machine to rest when the needle is elevated.

Figure 1 is a top view of sufficient part of a sewing-machine to illustrate our invention, part being broken away. Fig. 2 is a side view with part broken away. Fig. 3 is a rear elevation. Fig. 4; is an enlarged section at 4 4., Fig. 3. Fig. 5 is a detail showing the brakepin in contact with the fly-wheel. Fig. 6 is a detail showing the brake-pin within the brakenotch. Fig. '7 is a detail showing the position of the brake-pin relatively to the fly-wheel when the machine is running.

Ais the bed-plate; B, the goose-neck, l, the needle-bar, and D the needle-driving shaft.

E is the fly-wheel, which is made fast to the shaft D. The fly-wheel has in the rear side a central recess, 6, that receives the frictionflange F of the grooved pulley F, over which the driving-belt passes. When the parts are in the position shown in Figs. 1, 2, and 4, the friction-disk F bears against the bottom of the recess a, or a friction-plate, c, and thus the rotary motion of the pulley F is communicated to the wheel E. \Vhcn the pulley is not forced against the fly-wheel, a spring, G, acts to force the friction-surfitces of the pulley and fiy-wheel asunder, so that the pulley does not actuate the wheel. The pulleyF has a central boss, F", against which presses a pin, II, that is movable in the upper end of an arm, I, of a lover, I. The lever I is fulcrumed at .I to a bracket, K, extending from the rear of the goose-neck.

Iris a spring bearing against the rear end of the pin H and forcing it against the boss F The force of the spring is regulated by means of screws M ill, by which it is attached to the arm I.

N is a connecting-rod engaging with the lower arm, 1*, of the lever I, the other end being connected to a hand-lever, Q, by a clip, 0, and link P, or other means.

R is a spiral spring upon the rod N, one end of said spring bearing against the inner side of the goose-neck and the other end against a pin or collar, N, so as to draw the arm I to ward the bed-plate A when the lever Q is released from the inclined catch A, by which the parts are held in the position shown in Figs. 1, 2, 3, 4. \Vhen the lever is disengaged from the catch A and the spring R allowed to act, the arm I and pin H are thrownbackward and the frictiondisk F thrown out of frictional contact with the fly-wheel, so that the latter may be brought to rest.

I is an arm of the lever 1, extending up between the goose-neck and the fly-wheel. In the upper end of the arm I is a movable brake pin, S, with a spring, T, bearing thereon, so as to force the pin toward the fly-wheel. The backward movement of the arm I (as the lever I is moved by the spring R) brings the brakepin S in contact with the fiy-wheel, and it acts as a brake thereon to check the motion of the wheel. Upon the inner side of the fly-wheel are twojaws, U, inclined upon the outer sides, whose ends are about at right angles with the face of the wheel E, thus forming a notch or gap, V, to receive the point of the brake-pin to bring the fly-wheel to a standstill. The position of the brake-pin when brought in contact with the fly-wheel to check its motion is shown in Fig. 5. In Fig. 6 the pin is shown in the notch. In Fig. 7 the relative positions of the pin S and fly-wheel when the machine is running are shown. The position of the jaws upon the fiy-wheel is such that the machine is always brought to a stop when the needle is elevated, so that the work is left free 9 5 for removal. In case it is preferred to stop the machine when the needle is in other position, the parts may be arranged accordingly.

e claim herein as our invention 1. The combination, in a sewingmachine,

of a fly-wheel having a notch therein, and a wheel F, lover I, with arm I, with push-pin brake constructed to enter said notch, sub- H, brake-arm 1 with brake S T, arm 1", rod

stantially as and for the purpose set forth. N, spring R, hand-lever Q, connected to rod 2. A sewing-machine brake having the fol- N, and catch A, substantially as set forth. 5.1owing elements: a brake-lever with spring T brake S T working therein, and a fly-wheel OYERS' with inclined jaws U upon its face, substantially as and. for the purpose set forth. \Vitnesses:

3. The combination, in a sewing-machine, g SAMIL. KNTGH'I, :0 of fly-whee] E, with jaws U, friction drive- 1 GEO. H. Kmjmri. 

